package com.ruoyi.framework.aspectj;

import java.util.Objects;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.annotation.AnnotationUtils;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;
import com.ruoyi.common.annotation.DataSource;
import com.ruoyi.common.config.datasource.DynamicDataSourceContextHolder;
import com.ruoyi.common.utils.StringUtils;

/**
 * 多数据源处理
 * 
 * @author ruoyi
 */
@Aspect
@Order(1)
@Component
public class DataSourceAspect{
	protected Logger logger = LoggerFactory.getLogger(getClass());

	@Pointcut("@annotation(com.ruoyi.common.annotation.DataSource)" + "|| @within(com.ruoyi.common.annotation.DataSource)")
	public void dsPointCut(){

	}

	@Around("dsPointCut()")
	public Object around(ProceedingJoinPoint point) throws Throwable{
		DataSource dataSource = getDataSource(point);

		if(StringUtils.isNotNull(dataSource)){
			DynamicDataSourceContextHolder.setDataSourceType(dataSource.value().name());
		}

		try{
			return point.proceed();
		}finally{
			// 销毁数据源 在执行方法之后
			DynamicDataSourceContextHolder.clearDataSourceType();
		}
	}

	/**
	 * 获取需要切换的数据源
	 */
	public DataSource getDataSource(ProceedingJoinPoint point){
		MethodSignature signature = (MethodSignature)point.getSignature();
		DataSource dataSource = AnnotationUtils.findAnnotation(signature.getMethod(), DataSource.class);
		if(Objects.nonNull(dataSource)){
			return dataSource;
		}

		return AnnotationUtils.findAnnotation(signature.getDeclaringType(), DataSource.class);
	}
}
